Speaker



FIG. 1 is a front perspective view of a speaker showing my new design;

FIG. 2 is bottom perspective view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a rear elevational view thereof.

The broken lines illustrated in the figures are not part of the design sought to be patented and are shown to illustrate the environment related to the claimed design. 

The ornamental design for a speaker, as shown and described. 